Abstract : A test target for adaptive optics comprising, in the preferred embodiment, a plurality of nine adjacent, stacked, and aligned rows of a multiplicity of alternate opaque sections and transparent sections in a repeating bar pattern, with all sections being positioned on a flat transparent medium (such as film or glass), and with each opaque section being an opaque bar and with each transparent section being a transparent bar. Each row has a different spatial frequency than any other of the nine rows, with the spatial frequency of any one row being of a different multiple of the row having the lowest spatial frequency. As a matter of preference, the nine adjacent, stacked, and aligned rows are stacked with the first and lowermost row having the lowest spatial frequency, and with the ninth and uppermost row having the highest spatial frequency. (Author)